Device in connection with reel-up of a web

ABSTRACT

A device for use in a reel-up of a paper web, the reel-up including a reeling cylinder mounted on bearings to guide a web on to a reeling axle. The device includes an actuator and a control member for setting and controlling the distance between the reeling cylinder and the reeling axle. The device further includes an actuator and a control member for effectuating and maintaining a force effect between the reeling cylinder and the reeling axle.

FIELD OF THE INVENTION

The present invention relates to a device in connection with a reel-upof a web. The invention also relates to a method in connection with areel-up of a web.

BACKGROUND OF THE INVENTION

Reel-ups of web-like materials are used for reeling a material passed ina continuous web into a tight reel, so that it can be transferred tofurther processing. In the reel-ups of a paper web, a continuous paperweb passed from a paper machine, a coating machine or correspondingpaper processing apparatus is reeled around a reeling axle i.e. a reel,spool, to form a reel. For example in a so-called Pope-reeler, or in acenter-drive assisted Pope-reeler, the finished paper is reeled around areeling axle. The web is passed on the reel via a reeling cylinderrotatably arranged, against which the reeling axle is loaded by means ofa loading device located in connection with the reeling axle.

The web is passed to the reeling axle via a nip formed between thepreceding layers of the reel and the mantle surface of the reelingcylinder. At this point where the web enters in contact with thepreceding layers of the reel, the web is, due to the aforementionedloading device, affected by a particular nip load, linear pressure. Inpresent-day reel-up types, the reeling nip between the reeling cylinderand the reel primarily prevents the access of air into the reel. Bycontrolling the loading exerted on the web it is, however, also possibleto control the tightness of the reel that is being formed, and inaddition to this, the aim is to change the loading during the reeling,so that the tightness of the reel would comply with the qualityrequirements set by the paper grade and the finishing process indifferent sections in the radius of the reel. The reeling process iscontrolled indirectly by adjusting the reeling parameters (e.g. linearload, web tension, peripheral force and reeling force). The adjustmentis typically conducted with a special program. The main objective of thereeling is to reel a continuous paper web to form a reel which fulfillsthe requirements imposed thereupon by the reeling process and furtherprocessing with respect to processibility and thereby the structure ofthe reel as well as the paper quality.

When the old reel has become full, the web has to be cut and the windingof the web following the cut-off point around a new reeling axle has tobe started. In practice, this takes place in such a way that when thepaper roll formed around the reeling axle has accumulated into its fullsize, a new empty reel is transferred, typically simultaneously and fromabove the reeling cylinder, onto the surface of the reeling cylinder,while the paper web is left therebetween. The full paper reel istransferred away from the reeling cylinder, and thereafter the paper webis cut with a suitable way and the end of the web following the cut-offpoint is guide d onto the perimeter of an empty reeling axle, onto whichthe new web begins to accumulate to form a reel. Thereafter the newreeling axle is transferred to a reeling carriage, travelling onseparate linear guides, or on top of horizontal reeling rails. The reelthat has become full is transferred e.g. by means of a transfer devicealong the reeling rails to an unloading station, and at the same time anew reeling axle is brought onto the reeling rails. During the initialreeling process the loading is controlled by means of force devices ofthe initial reeling device, and when the reeling axle has beentransferred e.g. to the reeling carriage, the loading is controlled bymeans of force devices coupled to the reeling carriage, typically bymeans of pressurized medium operated actuators, i.e. cylinders.

For example U.S. Pat. No. 4,634,068 discloses a reeling apparatusequipped with force devices of the initial reeling device, i.e. with aseparate loading cylinder and a relief cylinder, and when the reelingaxle is on the reeling rails, with a loading cylinder which presses theaxle against the reeling cylinder. The used loading cylinder is couplede.g. to swinging arms turnably articulated in the frame of the reel-up.By means of the relief cylinders it is possible to compensate for theeffects of gravity on the reeling cylinder, and thus these are used forso-called profiling. Typically in the initial reeling device theloading, relieving and the adjustment of the position of the reelingaxle with respect to the reeling cylinder are conducted by means of onedouble-acting pressurized medium operated cylinder. In the reel-up theloading force is determined by measuring the angular position of theswinging arms. The loading force is adjusted by means of an actuatorcoupled to the swinging arm.

In a control circuit of a reel up, which is disclosed in the U.S. Pat.No. 5,285,979, the loading takes place by means of a carriage moving inthe frame of the reel-up along linear guides, to which carriage theloading force device is connected. In the publication the reeling axleis arranged in a swinging arm turnably journalled to the carriage, whichswinging arm, however, remains stationary during the loading and is onlyused when the full reel is removed by turning the swinging arms to thedirection of removal with special removal cylinders. The aforementionedforce device is used to supply the desired loading force or to transferthe reeling axle further away from the reeling cylinder as the size ofthe reel grows. The actual loading force is affected by many factorssuch as the friction produced by the motion of the force device as wellas the kinetic friction of the structure supporting the reeling axlewhen it is moved. The loading force is measured in the device withsensor means arranged in connection with the swinging arm.

There are also known reel-ups such as the one presented in EP patent604558 and in the related U.S. Pat. No. 5,393,008. The patent disclosescarriages arranged which are linearly movable in guides parallel to thereeling rails, the position of the carriages being determined on thebasis of hydraulic cylinders coupled between the frame of the reel-upand the carriages. Thus, by means of these hydraulic cylinders, thelocation of the reeling axle is at the same time also adjusted withrespect to the reeling cylinder. The carriages are provided withseparate pressing devices which press the bearing housings located atthe ends of the reeling axle and resting on the reeling rails with anadjustable force towards the reeling cylinder to produce the necessarynip pressure. On the other side of the bearing housing, the carriagesare also provided with positioning devices by means of which thelocation of the reeling axle in the carriage can be adjusted moreaccurately. The loading force is measured in the device with sensormeans arranged in connection with the pressing device.

The publication EP 0 79 829 A2 discloses a reeling device in which thereeling cylinder is arranged in a moving carriage which is also providedwith a pressurized medium operated cylinder to function as a forcedevice to effect a loading between the reeling cylinder and the reel.The carriage can be moved by means of separate actuators.

In the above-described cases, to control e.g. the reeling carriage, theinitial reeling device and the loading device, hydraulic cylinders aretypically used in pairs to control the different ends of the reelingaxle. Thus, the control of the ends is arranged for example by means ofan integrated carriage or a carriage arranged in connection with eachend to move independently.

In the above-described device the act of measuring the loading force ofthe nip is, however, arranged in a manner which is affected disturbinglyby frictions due to the function of the device, such as rollingfrictions, sliding frictions and other mechanical disturbances occurringin the members used for measurement.

In addition, in the above-described devices, separate apparatuses areused for adjusting both the loading force by controlling the pressure ofthe force devices and e.g. the position of said carriages by controllingthe actuators. This results in a complicated control process andrequires a considerable accuracy and reliability especially from thepressure adjustment.

OBJECTS AND SUMMARY OF THE INVENTION

It is an aim of the present invention to eliminate the drawbacks ofprior art and to present a simple and reliable device to be used inconnection with a reel-up, for example to control the loading, i.e.so-called nip load, between a reeling cylinder and a reeling axle whichis placed in the transfer carriage of the reel-up and controlled bymeans of separate carriages from its ends and located in the initialreeling device or placed on reeling rails, or to control the distancebetween the same or the mutual position of the same by means ofpressurized medium operated cylinders. It is a central principle of theinvention to apply an elastic element that stores energy.

It is a considerable advantage of the device according to the presentinvention that it is possible to implement the adjustment of the loadingforce in a very simple manner by means of position adjustment, conductedwith actuators functioning as force devices, wherein it is possible toavoid pressure adjustment. This makes the construction of the sensormeans required in the reel-up considerably more simple, and facilitatesthe adjustment to be conducted. Advantageously, the loading and thepositioning is taken care of by a pair of pressurized medium operatedcylinders. Another advantage of the invention is that by directlymeasuring the dimension changing according to the loading force of theelement, especially the disturbing effects of the friction forcesaffecting the measurement are avoided. Furthermore, it is an advantageof a preferred embodiment of the invention that the element isindependent of an external power source, wherein it utilizes only theenergy stored therein. The energy is stored in the element in a verysimple manner for example by compressing it in connection with theposition adjustment.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention will be described in more detail withreference to the appended drawings in which:

FIG. 1 is a side elevational view of a prior art reel-up of a web, and

FIGS. 2a to 2 d are reduced side elevational views of the devicesaccording to the preferred embodiments of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 is a reduced skeleton diagram showing a side view a reel-up of apaper web, known as such. As is well known, the reel-up is provided witha reeling member, typically a rotatable reeling cylinder C, by means ofwhich a continuous paper web W passed from a paper machine, a coatingmachine or another paper processing apparatus is reeled around a reelingaxle T1 to form a machine reel R. There are also other known reelingmembers, such as a belting, for guiding the web W onto the reeling axleT1. The reel R is loaded against the reeling cylinder C by applying aforce F1 of desired strength, directed towards the reeling cylinder C,to the reeling axle T1. This produces a reeling nip N1 between the reelR and the reeling cylinder C, where a nip pressure of particularstrength prevails as a result of the loading. The reeling axle T1 isadvantageously also provided with a centre-drive, wherein the reel-up inquestion is a centre-drive assisted Pope reel-up, in.which the torque ofthe reeling axle T1 can also be used to affect the quality of the reel Rbeing formed. FIG. 1 also shows a reeling axle T2 brought in connectionwith the reeling cylinder C by means of an initial reeling device of thereel-up. The reeling axle T2 is loaded against the reeling cylinder C byapplying a force F2 of desired strength directed towards the reelingcylinder C, to the reeling axle T2. This produces a reeling nip N2between the reeling axle T2 and the reeling cylinder C, where a nippressure of particular strength prevails as a result of the loading. Inthis case, the nip pressure is also affected by the weight of thereeling axle T2.

The reeling cylinder C is pivoted in a way known as such to a frame K1of the reel-up, stationary with respect to a supporting base, such asthe floor level of a factory. The reeling axle T1, in turn, is pivotedin a way known as such on top of reeling rails K2 on the support ofwhich the ends of the reeling axle T1 rest at the bearing housings, andwhich at the same time support the weight of the reel R. The supports V1of a carriage or a slide V, pivoted in a way known as such and moving ina linear guide K3 located in the frame K1, are utilized to maintain theforce exerted on the reeling axle T1, and at the same time the carriageis moved in the longitudinal direction (arrow X) of the reel-up when thesize of the reel R is increased during the reeling process. A knownstructure is presented in more detail e.g. in the European patent604558. The carriage V also moves in the longitudinal direction of thereel-up and it is of such a type that excluding a weight possiblyreceived by the reeling cylinder C, the reeling rail K2 supports theentire weight of the reeling axle T1 and the reel R. The carriage V isarranged.in a way known as such to move in linearly with respect to thereeling cylinder C, and the motion is possible in both directions; inother words, if necessary, the carriage V can be moved back and forth(arrow X) by means of double-action cylinders when necessary. Thecarriage V can move on top of fixed linear guides or it can be guided byrails. The support V1 or its parts, articulated in the carriage V toturn with respect to a pivot located therein, can also be transferred bymeans of separate hydraulic cylinders (not shown in the drawing), e.g.to move the completed reel away from the carriage V.

With reference to FIG. 1, to attain the desired nip load (nip pressure),the reel R is loaded against the reeling cylinder C with a predeterminedloading force F1 by affecting the reeling axle T1 by means of forcedevices 1, hereinafter also called as an actuator 1. These actuators areincluded in the first control means of the reel-up which are arrangedfor setting and maintaining the distance between the reeling cylinder Cand the reeling axle T1, which are placed substantially in parallel. Thefirst control means also comprise the necessary control members 3 (inthe drawing also CTR), for example an actuator 1 and electricallycontrolled valves for controlling the actuator 1 by means of apressurized medium in a way known as such. The first control means areconnected to a control system 4, which is for example a computer or aprogrammable logic (PLC, not shown in the drawing) equipped with memorymeans and a microprocessor. In the control system 4, e.g. the necessarymonitor and control algorithm is stored e.g. to control the controlmembers 3 in such a way that the actuator 1 is transferred to a desiredposition or the actuator 1 is maintained in the desired position,wherein position adjustment is conducted.

The reel-up also comprises second control means to effect and maintain afirst force effect between the reeling cylinder C and the reeling axleT1 arranged substantially in parallel and in contact with each.other.The second control means comprise control members 3 (in the drawing alsoCTR), for example an actuator 1 and electrically controlled-valves forcontrolling the actuator 1 by means of a pressurized medium in a wayknown as such. In the reel-up of prior art according to FIG. 1, thefirst and second control means comprise a common actuator 1 and at leastpartially common control members 3. In the control system 4, at leastthe necessary monitor and control algorithm is stored e.g. to controlthe control members 3 in such a way that the pressure of the actuator 1is adjusted to a suitable value, or the pressure of the actuator 1 ismaintained on a suitable level in order to maintain the force effect F1on the desired level, wherein pressure adjustment is conducted. On thebasis of the above-described devices of prior art, it is obvious thatthe first and the second control means can also be separate devices.According to the present invention, the second control means can beconsiderably simplified.

Further referring to FIG. 1, a loading force F2 is effected in a similarmanner by means of force devices 11. The force devices 1, typically oneon each side of the reel R in a similar manner as force devices 11,affect the bearing housings of the reeling axle T1 which are typicallysupported by the reeling rails K2. The reeling axle T1 is transferredfurther away from the reeling cylinder, C when the reel R grows, i.e.the radius of the reel R is increased, wherein the carriages V aretransferred by means of force devices 1. When the reeling proceeds, thedesired nip load is attained by means of the force devices 1.

The force F1 effected by the loading actuators 1 can be adjusted. Themost typical force device which is used in the reel-ups, whose force canbe adjusted and by means of which large loading forces can be attained,is a pressurized medium operated force device, such as a hydrauliccylinder which is of such a type that it changes its length. Thehydraulic cylinder is connected to a pressure source of a hydraulicfluid, and the hydraulic pressure which is effective in the hydrauliccylinder and determines the loading force F1, can be adjusted in waysknown as such. Thus the adjustment in question is a so-called pressureadjustment, and on the other hand, when e.g. the reel R is transferredby means of the hydraulic cylinder, or when its position is changed bycontrolling the volume flow of the hydraulic cylinder, the term positionadjustment is used. During the position adjustment, pressure is requiredto overcome the frictions during the transfer and to produce a flow inthe pipework of the hydraulic fluid by means of a pressure difference.The term position adjustment is also used in a situation when a desireddistance i.e. a nip gap is desired to be maintained for example duringthe reeling process.

With reference to FIGS. 2a to 2 d, the use of the element E according tothe invention will be described in more detail hereinbelow. The secondcontrol means comprise this elastic element E that stores energy, toproduce and maintain the first force effect F1. A change in a dimensionof the element E is proportional to the change in the first force effectF1, and the element E is arranged to store energy by compressing underthe effect of the force affecting the same, and to, release energy byexpanding. For the sake of clarity, in FIGS. 2a to 2 d, the element E isshown as a simple cylindrical round wire pressure spring E, but it isobvious that the element E can be some other component which functionsin the above-described manner. The variable dimension of the element Eis its height, width or length, depending on the manner in which thefunction of the element E is arranged, and in which way it is possibleto arrange the measurement. FIG. 2a also shows a variable dimension D,wherein the end of the element E rests on a stationary support 10, andthe other end affects the bearing arrangement 8, the position of whichend is thus changed, and this change can be measured with the sensormeans 6. Thus, the support 10 can function as a reference position.

According to the invention, the operating principle of the element E isthat a change in any dimension is proportional to thin force effectivethereon, and thus also to the magnitude of energy stored therein. Energyis stored in the element E as potential energy, which is thus releasedas a force effective in the element when the change in the dimension iselastically restored. When the element E functions elastically, its formis restored when the effective force is reduced or released, and,correspondingly, changes when the effective force is increased. Theproportionality of the force and the dimension can be described with afunction F=f(D,k_(n)(x_(n)), k_(n+l)(X_(n+l)), . . . ), in which F isthe effective force, D is the value of the dimension in question andk_(n), k_(n+j) etc. are factors dependent (i.e. functions of thevariables x_(n), x_(n+l) etc.) e.g. on the used materials, theconstruction and the operating principle, for example in the pressurespring one coefficient k_(n) is the spring constant of the spring. Thefunction F can be determined e.g. by means of measurements. In itssimplest form the function is linear and of the form F=k·D, but thedependency can also deviate from the linear one e.g. by beingprogressive. The dependency can also be arranged into a form in which ΔFis the change in the force, which is dependent e.g. on the change in thedimension ΔD. Between the force effect F1 and the force F, which will bedescribed hereinbelow, there still prevails a dependency F1=f(F), whichis dependent e.g. on the construction of the bearing arrangement, andthus the loading force F1 can be adjusted according to the invention bycontrolling the dimension D. This control takes places e.g. by affectingthe slide V with the actuator 1, whereafter the slide V, in turn,presses the pressure spring functioning as the element E against, thebearing arrangement. The actuator 1 is simultaneously controlled bymonitoring the dimension D. For example the force F1 can be controlledby keeping the dimension D substantially constant.

Further referring to FIGS. 2a to 2 d, the reel-up also comprises thenecessary sensor means 6 for determining the first force effect F1, andthese sensor means 6 are connected to the control system 4 to transmite.g. measurement information. In the device according to the invention,these sensor means 6 are arranged to measure, either directly orindirectly, a dimension of the element E described hereinbelow, whereinthe measurement in question is a measurement of length, position ordistance, or a measurement with respect to the reference position,depending on the manner in which the measurement is arranged, or on themeasuring devices which are desired to be used. In the measurement it ispossible to utilize devices known as such, which functionmechano-electrically, capacitively, inductively, photoelectrically orfor example by means of ultrasound, and transmit the measurementinformation in an analog or digital signal to the control system 4. Intheir simplest form the sensor means 6 comprise for example apotentiometer which functions in a linear manner.

Hereinabove, the function of an initial reeling device was alsodescribed, wherein one has to take into account the effect of gravity inparticular. For example the weight of the reeling axle can increase orreduce the force effect F1, depending on the vertical position of thesame with respect to the reeling cylinder. Thus, especially the elementE placed in a diagonal position can also be affected by the weight ofthe reeling axle, which can be easily taken into account in theabove-described dependency, wherein when the reel grows, and the weightincreases, time also constitutes one factor in the dependency. Withreference to FIGS. 2a to 2 d, the element E is arranged effectivesubstantially in the longitudinal direction of the reel-up, i.e.horizontally, wherein the bearing arrangements 7 and 8 of the reelingaxle T1 and the reeling cylinder C are arranged substantially on thesame horizontal level, wherein the effect of the gravity is minimized.In case of said pressure spring, the compression and expansion arearranged to take place in the direction of the effective force, whereinthe changing dimension is the length of the pressure spring. In case ofthe pressure spring, the size of its diameter does not change when theforce affects the spring, and energy is stored in the spring when it iscompressed. There are also known cylindrical pressure springs in whichthe shape of the wire varies and which are typically made of compositionmetals. There are also known spring constructions to which severalssprings are connected to attain for example a phased or a progressivefunction. In addition, there are known cylindrical draw-springs whereinenergy is stored in the spring when its length is increased, accordingto which the function of the element E also has to be arranged.Furthermore, there are e.g. known multi-disc springs and leaf springs,in which the change occurs in the longitudinal direction, but there arealso known spiral springs and torsion springs in which the change occursas an arch-like shift and typically also as a change in the diameter. Aspecial advantage of e.g. the pressure spring and the draw-spring is thechange in the dimension occurring in the direction of the forceeffective therein, the simple construction and the independency onexternal energy sources, for example electric energy or the energy of apressurized medium.

Naturally, the spring-like element E that stores energy can also be asuitable compressible gas or liquid, which is closed within a volume andwhich is affected for example by means of a moving piston. Thus, it ispossible to utilize for example the position of the piston to measure achange in the dimension of the volume. The selection of the element E isalso dependent on the extent of the change in the dimension, and on thathow accurately the change can be measured. Typically, the change isgreater in gaseous substances than in solid substances. The element canalso be a pressurized medium operated cylinder, which is possiblyconnected to a pressure accumulator.

With reference to FIGS. 2a to 2 d, the use of the device according tothe invention in connection with a reel-up will be described hereinbelowin more detail by means of preferred embodiments. On the basis of thedescription it is obvious for anyone skilled in the art how theinvention can be implemented in connection with other types of reel-upswithin the scope of the claims. According to the description above, thereel-up comprises a reeling cylinder C mounted on bearings 7 in thereel-up to guide a web travelling in the longitudinal direction of thereel-up according to FIG. 1, which reeling cylinder C is arranged torotate around a direction transverse to the web, and a reeling axle T1mounted on bearings 8 in the reel-up to reel the web around the reelingaxle T1, which reeling axle T1 is arranged to rotate around a directiontransverse to the web.

According to the invention, the reel-up comprises at least one guide orthe like, and at least one bearing arrangement 7 or 8 is arranged tomove by means of a guide or the like in the longitudinal direction ofthe reel-up, wherein the element E is also arranged to affect saidbearing arrangement 7 or 8. The guide (or the like) shown in FIGS. 2a to2 d is a guide 9 positioned in a slide V arranged to move in thelongitudinal direction of the reel-up. The reeling rail K2 shown in FIG.1, is shown with broken lines in FIGS. 2b to 2 c to illustrate analternative construction of the reel-up. Especially the reeling axle T1is advantageously placed on top of the reeling rail K2, along which itis transferred according to FIG. 2b . In FIG. 2c, the reeling axle T1 ismounted on bearings in a fixed position at least for the duration ofmost of the reeling process, but the supports V1 can also be arranged ina moving carriage (not shown in FIG. 2c), which, in turn, is controlledwith an actuator (not shown in FIG. 2c) separate from the actuator 1 ina similar manner as in FIG. 2b . Said actuator can be connected to thecontrol members 3. A more detailed arrangement by means of which theelement E affects the bearing, is obvious to anyone skilled in the art,and it can be implemented in various ways. In FIGS. 2a to 2 d thisarrangement is shown in a simple manner by means of a support 10arranged in the slide V and the element E affecting the bearingarrangement directly, and it is obvious that for example the element Ecan also affect the bearing arrangement indirectly, wherein the bearingarrangement may be provided with supports corresponding to the supportscontrolling the bearing arrangement of FIG. 1.

In the embodiment of FIG. 2a , the element E is arranged to affect thebearing arrangement 8 of the reeling axle T1, wherein the first controlmeans are arranged to move the reeling axle T1. In FIG. 2a , the reelingcylinder is mounted on bearings onto a fixed position, but the supportsV1 can also be arranged in a moving carriage (not shown in FIG. 2a),which, in turn, is controlled with an actuator (not shown in FIG. 2a )separate from the actuator 1 in a similar manner as in FIG. 2d. Saidactuator can be connected to the control members 3. In the embodiment ofFIG. 2c, the element E is arranged to affect the bearing arrangement 7of the reeling cylinder C, wherein the first control means are arrangedto move the reeling cylinder C. In both cases the guide 9 and theelement E are arranged in the slide V, which is arranged to be moved bythe first control means. The transfer takes place in the above-describedmanner by means of the actuator 1 and the control members 3.

On the basis of the description above, there are also known reel-ups inwhich the bearing arrangement is affected by means of a force devicecoupled to the swinging arms articulated turnable on the frame of thereel-up, which force device corresponds to the actuator 1. Thus, theelement E can be arranged in connection with the swinging arm inquestion. Also in this case, the reeling cylinder C or the reeling axleT1 can be located on top of the reeling rail K2.

In the embodiment of FIG. 2b the element E is arranged to affect thebearing arrangement 7 of the reeling cylinder C, wherein the firstcontrol means are arranged for moving the reeling axle T1. In theembodiment of FIG. 2d, the element E is arranged to affect the bearingarrangement 8 of the reeling axle T1, wherein the first control means,are arranged to move the reeling cylinder C. In both cases the guide 9and the element E are arranged in a fixed position 13, and the firstcontrol means are arranged to move the slide V. The transfer takes placein the above-described manner by means of the actuator 1 and the controlmembers 3. In the embodiment of FIG. 2b the bearing arrangement 8 isarranged in the slide V to transfer the reeling axle T1 and in theembodiment of FIG. 2d the bearing arrangement 7 is arranged in the slideV to move the reeling cylinder C.

According to the invention, the force effect F1 can now be adjusted insuch a way that the dimension D, which tends to change when the reelgrows and the force effect increases, is measured when for example theslide V has been positioned into a desired point. By means of positionadjustment the slide V is transferred into such a position, that thedimension D is the desired one. Because the above-described dependencyprevails between the dimension D and the force effect F1, it is thuspossible to adjust the force effect in a very simple manner. Thisadjustment is implemented by means of the monitor and control algorithmstored in and implemented by the control system 4, wherein the controlsystem 4 is coupled to the sensor means 6 to attain measurementinformation and at least to the control members 3 of the first controlmeans to affect the element E. In connection with the measurement themeasured information can be processed, filtered or their average valuecan be calculated, wherein for example the changes in the dimensionwhich result from impacts and unevenness of the reel, would notinterfere with the measurement itself. Thus, a further advantage of apreferred embodiment of the element is that it endures impacts andvariations in.the loading better than rigid structures of prior art,wherein for example the cushioning of the reel-up can be more easilyarranged.

It is obvious for anyone skilled in the art that the invention is notrestricted solely to the above-described preferred embodiment, but itcan vary within the scope of the claims. It is also obvious for anyoneskilled in the art that the above-described element can be applied inconnection with various reel-up applications.

What is claimed is:
 1. A reel-up for a web comprising: a reeling means(C) mounted on a first bearing arrangement (7, 8) to guide a web (W)traveling in the reel-up on to a reeling axle (T1), a reeling axle (T1)mounted on a second bearing arrangement (7, 8) in the-reel-up to reelthe web (W) around the reeling axle (T1), said reeling axle (T1)arranged to rotate around a direction transverse to the web (W), firstcontrol means (1, 3) for setting and controlling a distance between thereeling means (C) and the reeling axle (T1), second control means (1, 5)for effecting and maintaining a force effect (F1) between the reelingmeans (C) and the reeling axle (T1), the second control means (1, 5)comprising an elastic element(E) that stores energy, to effect andmaintain the force effect (F1), in which element (E) a change in adimension (D) is proportional to a change in the force effect (F1), andsensor means (6) which are arranged to measure said dimension (D). 2.The reel-up according to claim 1, further comprising: at least one guide(9), and wherein at least one of said first and second bearingarrangements (7, 8) are structured and arranged to move by means of theguide (9) in a longitudinal direction of the reel-up, and that theelement (E) is structured and arranged to apply a force said at leastone of said first and second bearing arrangements (7, 8).
 3. The reel-upaccording to claim 2, wherein the element (E) is structured and arrangedto apply a force to at least the first bearing arrangement (7, 8) of thereeling means (C), wherein the first control means (1, 3) are structuredand arranged for moving the reeling axle (T1).
 4. The reel-up accordingto claim 3, wherein the reeling axle (T1) is structured and arranged tobe moved by means of a second slide (V) in a longitudinal direction ofthe reel-up, and wherein the first control means (1, 3) is structuredand arranged to move said second slide (V).
 5. The reel-up according toclaim 3, wherein the reeling means (C) is structured and arranged to bemoved by means of a second slide (V) in a longitudinal direction of thereel-up, and wherein the first control means (1, 3) is structured andarranged to move said second slide (V).
 6. The reel-up according toclaim 2, wherein the element (E) is structured and arranged to apply aforce to at least the second bearing arrangement (7, 8) of the reelingaxle (T1), wherein the first control means (1, 3) are structured andarranged for moving the reeling means (C).
 7. The reel-up according toclaim 2, wherein the element (E) is structured and arranged to apply aforce to the first bearing arrangement (7, 8) of the reeling means (C),and that the guide (9) and the element (E) are structured and arrangedin a first slide (V) arranged to move in a longitudinal direction of thereel-up, said slide being structured and arranged to be moved by thefirst control means (1, 3).
 8. The reel-up according to claim 2, whereinthe element (E) is structured and arranged to apply a force to thesecond bearing arrangement (7, 8) of the reeling axle (T1), and that theguide (9) and the element (E) are structured and arranged in a firstslide (V) structured and arranged to move in a longitudinal direction ofthe reel-up, said slide being structured and arranged to be moved by thefirst control means (1, 3).
 9. The reel-up according to claim 1, whereinthe element (E) is structured and arranged to store energy bycompressing when affected by an effective force acting thereon and torelease energy by expanding when said effective force is removed, andthat the compression and expansion is arranged to take placesubstantially in a direction of the effective force.
 10. The reel-upaccording to claim 1, wherein the element (E) is at least partly formedas one of a pressure spring and a draw-spring.
 11. The reel-up accordingto claim l, wherein the reel-up further comprises: a control system (4)connected to the sensor means (6) to guide the first and the secondcontrol means (1, 3, 5, E).
 12. A method for arranging a reel-up of aweb comprising the steps: mounting a reeling means (C) on a firstbearing arrangement (7, 8) in the reel-up to guide a web (W) travelingin the reel-up on to a reeling axle (T1), mounting a reeling axle (T1)on a second bearing arrangement (7, 8) in the reel-up to reel the web(W) around the reeling axle (T1), which reeling axle (T1) is arranged torotate around a direction transverse to the web (W), effecting andmaintaining a force effect (F1) between the reeling means (C) and thereeling axle (T1) at least partly by means of an elastic element (E)that stores energy, in which element (E) a change in the dimension (D)is proportional to a change in the force effect (F1), and monitoringsaid dimension (D) to control the force effect (F1).
 13. The methodaccording to claim 12, further comprising the step of: maintaining thedimension (D) in a predetermined value by controlling the positions ofthe reeling means (C) and the reeling axle (T1) related to each other.14. The method according to claim 13, further comprising the step of:controlling the positions of the reeling means (C) and the reeling axle(T1) related to each other by moving the reeling means (C) or thereeling axle (T1).
 15. A reel-up for a web comprising: reeling means (C)mounted on a first set of bearings (7) for guiding a web (W) travelingthrough said reel-up; a reeling axle (T1) structured and arranged forreceiving said web (W) from said reeling means, said reeling axle (T1)being mounted on a second set of bearings (8) for reeling said web (W)therearound, wherein said reeling axle (T1) is structured and arrangedto rotate in a direction transverse to a direction of movement of saidweb (W) though said reel-up; first control means (1, 3) structured andarranged for setting and controlling a distance between said reelingmeans (C) and said reeling axle (T1); second control means (1, 5)structured and arranged for effecting and maintaining a nip load betweensaid reeling means (C) and said reeling axle (T1); wherein said secondcontrol means (1, 5) comprises an elastic element (E) for storingenergy, wherein said elastic element (E) is responsive to said nip load,wherein a change in a length (D) of said elastic element (E) isproportional to a change in said nip load; and sensor means (6) adaptedto measure variations in said length (D) of said elastic element (E).